Add new automation field - subitem board (from context)

It would be nice if we could get the subitem board ID as a context field for automations.

Bringing this up because I know there is ongoing work on the automations. Being able to get the board ID without having to query the parent board for it would cut down on API queries. This of course assumes that the subitem board ID is known based on the board already.

Thank you for bringing this request @codyfrisch!!

Everyone, remember you can vote for this at the top of this screen :grin: